The linear and nonlinear growth functions in Cubic Galileon

被引：1

作者：

Song YanLing ^{[1
]}

Hu Bin ^{[1
]}

机构：

[1] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China

来源：

SCIENTIA SINICA-PHYSICA MECHANICA & ASTRONOMICA | 2021年 / 51卷 / 07期

关键词：

cosmology; gravity; dark energy; UNIVERSE; LAMBDA;

D O I：

10.1360/SSPMA-2021-0025

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We introduce the Lagrangian perturbation theory under Lambda CDM model, and extend it to the Cubic Galileon (G3) model. We present the second order growth function in G3 model based on the Lagrangian perturbation theory. We find that the effective Newtonian constant in G3 model is almost scale independent. Its value is bigger than that of the Lambda CDM model. In the late time dark energy dominated epoch, its value is enhanced by a factor about 2. Based on this, the linear and nonlinear growth functions in the structure formation for G3 model are larger than that of the Lambda CDM model. It means G3 model has stronger galaxy clustering effect than Lambda CDM model. Besides of this, we find the second order growth function can be separated into spatial and temporal dependent parts. Hence, one only needs to convolve different momentum configurations at the initial stage. This will significantly accelerate the numerical calculation.

引用

页数：9

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